Re: gtkmm Treeview is slow. Any tips?

[eric jrdn <eric_jrdn2 yahoo fr>]

Igor and Murray, thank you for your answers.

Making the Liststore the canonical store for my datas
was the solution i was complaining about. It was too
slow when loading something like 30Mo of simple
X,Y,description datas.
I'm going to write the new code using a custom
TreeModel with vectors. I compiled the treemodelcustom
example of gtkmm with 1 million datas. This worked
fine and fast, so I guess this is the solution of my
problem. My understanding of lower levels functions of
gtkmm is not yet very fine but i think this is worth
to do.


--- Murray Cumming <murrayc murrayc com> a écrit :

> 
> > Hello all,
> > I would like to build a specific tabler/data
> display
> > with Gtkmm.
> >
> > Data displaying is done with a drawing area and
> there
> > is no problem with this. When I do not need to
> view
> > the content of the data (ie just draw them) i use
> a
> > stl vector<double>  which is fast and easy to use,
> > even if the number of data equals something like
> > 100000 or 1 million. But I need to delete datas
> with a
> > right click on a spreadsheet, which requires a
> > Treeview and a ListStore : it is too slow for this
> > task. Does it exist any replacement of them, more
> > compatible with the stl vector class? Faster?
> >
> > The drawing area is linked with the data. The left
> and
> > right arrows move a cursor on the screen following
> the
> > datas. This is simple to do with a stl vector. How
> can
> > I browse the data counter back in a ListStore?
> >
> > For now, I duplicate(!) the datas : the same datas
> are
> > in a ListeStore and in a stl vector (this is
> > inefficient, that's why I ask you for a
> solution...),
> > and I use the one or the other if I have to do
> > something or something else. Problem arises when i
> > want to delete some datas and keep the two
> > synchronised. Does anyone know how to solve this
> and
> > avoid this stupid duplication of datas?
> >
> > Thank you in advance for your answers.
> > Eric
> 
> Avoiding duplication of large amounts of data
> usually requires a custom
> treemodel. There's a simple example in
> gtkmm/examples, and some real-world
> examples such as in Glom (and, I think, in
> gnome-db).
> 
> You might also try to make the ListStore the
> canonical store for your
> data, though it would obviously not be as efficient
> as the std::vector.
> 
> 
> Murray Cumming
> murrayc murrayc com
> www.murrayc.com
> www.openismus.com
> 
> 



	

	
		
___________________________________________________________________________ 
Appel audio GRATUIT partout dans le monde avec le nouveau Yahoo! Messenger 
Téléchargez cette version sur http://fr.messenger.yahoo.com